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- principal lithologic unit 主要岩性单位
- The Tongshan ore deposit is closely related to the eruptive rocks and intrusive rocks of the first bolcanocycle, taking the upper bed of the first lithologic unit and the ore-hodted horizon. 新疆第一岩性段顶部是主要含矿层位，矿床与第一火山旋回喷发相、侵入相关系密切。
- The application of the Jurassic lithologic units of the Yanshiping area to the Amdo area is inappropriate. 还应该指出的是，雁石坪地区侏罗纪岩石单位也不适宜在安多地区运用。
- My wages are the principal source of my income. 薪金是我收入的主要来源。
- The principal shareholder ask for a meeting. 主要股东们要求召开会议。
- The agent spoke on behalf of his principal. 代理人代表他的委托人说话。
- Keys are available on application to the principal. 向校长申请就可得到钥匙。
- The luminous intensity on unit area. 单位面积上的发光强度。
- She's been downgraded (from principal) to deputy. 她已(从校长)降为副校长。
- Our principal problem is lack of time. 我们的主要问题就是缺少时间。
- She drank in every word of the principal's lecture. 她全神贯注地听校长演讲的字字句句。
- The family is the smallest social unit. 家庭是社会最小的单位。
- John informed the principal against Paul. 约翰向校长告发了保罗。
- The central or principal vein of a leaf. 中脉中心的或主要的叶脉
- The principal discouraged unexcused absences. 校长不准无故缺课。
- Pressure is force per unit area. 压力就是电单位面积上的力。
- Rubber is the country's principal export. 橡胶制品是该国主要的出口产品。
- A set of data elements which are handled as a unit. 作为一个单元来处理的一组数据元素。
- The principal has a very tight schedule. 校长的日程表排得满满的。
- The family is the basic unit of society. 家庭是社会的基本单位。
